The invention provides an annular cooler for water seal. Inner and outer-side breast boards, a connecting beam and inner and outer-side rotating frame form a rotating body together, and an annular water seal device is arranged under the rotating body and is positioned between the lower part of the rotating body and a bellows; the water seal device is an annular continuous body, and comprises an inner-side annular water seal device and an outer-side annular water seal device. A grid plate is arranged on a supporting rack, one end of the supporting rack is connected with the connecting beam, and the other end of the supporting rack is suspended; the suspended end of the supporting rack and the rotating body are locked by a locking device; before entering a discharge area and when leaving the discharge area, an unlocking device and a locking device of the supporting rack are respectively arranged; a guidance device for turning the supporting rack down is arranged in the discharge area. The annular water seal structure is realized, the sealing effect is improved, and the air leakage amount is reduced by 30 to 40%; the structure is simple, the weight is light, and the cost is low; through the improvement on a walking device, the number of air leakage points is reduced, and further the air leakage rate is reduced; the power consumption is reduced, and the operating environment is improved.